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Vector Packet Processing
nsh_pop.c
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1 /*
2  * nsh_pop.c - nsh POP only processing
3  *
4  * Copyright (c) 2017 Cisco and/or its affiliates.
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at:
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 
18 #include <vnet/vnet.h>
19 #include <vnet/plugin/plugin.h>
20 #include <nsh/nsh.h>
21 #include <vnet/gre/gre.h>
22 #include <vnet/vxlan/vxlan.h>
24 #include <vnet/l2/l2_classify.h>
25 
26 #include <vlibapi/api.h>
27 #include <vlibmemory/api.h>
28 
29 extern nsh_option_map_t * nsh_md2_lookup_option (u16 class, u8 type);
30 
31 extern u8 * format_nsh_header (u8 * s, va_list * args);
32 extern u8 * format_nsh_node_map_trace (u8 * s, va_list * args);
33 
34 /* format from network order */
35 u8 * format_nsh_pop_header (u8 * s, va_list * args)
36 {
37  return format_nsh_header(s, args);
38 }
39 
40 
41 
42 u8 * format_nsh_pop_node_map_trace (u8 * s, va_list * args)
43 {
44  return format_nsh_node_map_trace(s, args);
45 }
46 
47 
48 static uword
50  vlib_node_runtime_t * node,
51  vlib_frame_t * from_frame)
52 {
53  u32 n_left_from, next_index, *from, *to_next;
54  nsh_main_t * nm = &nsh_main;
55 
56  from = vlib_frame_vector_args(from_frame);
57  n_left_from = from_frame->n_vectors;
58 
59  next_index = node->cached_next_index;
60 
61  while (n_left_from > 0)
62  {
63  u32 n_left_to_next;
64 
65  vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next);
66 
67  while (n_left_from >= 4 && n_left_to_next >= 2)
68  {
69  u32 bi0, bi1;
70  vlib_buffer_t * b0, *b1;
71  u32 next0 = NSH_NODE_NEXT_DROP, next1 = NSH_NODE_NEXT_DROP;
72  uword * entry0, *entry1;
73  nsh_base_header_t * hdr0 = 0, *hdr1 = 0;
74  u32 header_len0 = 0, header_len1 = 0;
75  u32 nsp_nsi0, nsp_nsi1;
76  u32 error0, error1;
77  nsh_map_t * map0 = 0, *map1 = 0;
78 
79  /* Prefetch next iteration. */
80  {
81  vlib_buffer_t * p2, *p3;
82 
83  p2 = vlib_get_buffer(vm, from[2]);
84  p3 = vlib_get_buffer(vm, from[3]);
85 
88 
91  }
92 
93  bi0 = from[0];
94  bi1 = from[1];
95  to_next[0] = bi0;
96  to_next[1] = bi1;
97  from += 2;
98  to_next += 2;
99  n_left_from -= 2;
100  n_left_to_next -= 2;
101 
102  error0 = 0;
103  error1 = 0;
104 
105  b0 = vlib_get_buffer(vm, bi0);
106  b1 = vlib_get_buffer(vm, bi1);
107  hdr0 = vlib_buffer_get_current(b0);
108  nsp_nsi0 = hdr0->nsp_nsi;
109  header_len0 = hdr0->length * 4;
110 
111  hdr1 = vlib_buffer_get_current(b1);
112  nsp_nsi1 = hdr1->nsp_nsi;
113  header_len1 = hdr1->length * 4;
114 
115  /* Process packet 0 */
116  entry0 = hash_get_mem(nm->nsh_mapping_by_key, &nsp_nsi0);
117  if (PREDICT_FALSE(entry0 == 0))
118  {
119  error0 = NSH_NODE_ERROR_NO_MAPPING;
120  goto trace0;
121  }
122 
123  /* Entry should point to a mapping ...*/
124  map0 = pool_elt_at_index(nm->nsh_mappings, entry0[0]);
125  if (PREDICT_FALSE(map0 == 0))
126  {
127  error0 = NSH_NODE_ERROR_NO_MAPPING;
128  goto trace0;
129  }
130 
131  /* set up things for next node to transmit ie which node to handle it and where */
132  next0 = map0->next_node;
133  //vnet_buffer(b0)->sw_if_index[VLIB_TX] = map0->sw_if_index;
134 
136  {
137  /* Manipulate MD2 */
138  if(PREDICT_FALSE(hdr0->md_type == 2))
139  {
140  if (PREDICT_FALSE(next0 == NSH_NODE_NEXT_DROP))
141  {
142  error0 = NSH_NODE_ERROR_INVALID_OPTIONS;
143  goto trace0;
144  }
145  //vnet_buffer(b0)->sw_if_index[VLIB_RX] = map0->sw_if_index;
146  }
147 
148  /* Pop NSH header */
149  vlib_buffer_advance(b0, (word)header_len0);
150  goto trace0;
151  }
152 
153  entry0 = hash_get_mem(nm->nsh_entry_by_key, &map0->mapped_nsp_nsi);
154  if (PREDICT_FALSE(entry0 == 0))
155  {
156  error0 = NSH_NODE_ERROR_NO_ENTRY;
157  goto trace0;
158  }
159 
160  trace0: b0->error = error0 ? node->errors[error0] : 0;
161 
162  if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
163  {
164  nsh_input_trace_t *tr = vlib_add_trace(vm, node, b0, sizeof(*tr));
165  clib_memcpy_fast ( &(tr->trace_data), hdr0, (hdr0->length*4) );
166  }
167 
168  /* Process packet 1 */
169  entry1 = hash_get_mem(nm->nsh_mapping_by_key, &nsp_nsi1);
170  if (PREDICT_FALSE(entry1 == 0))
171  {
172  error1 = NSH_NODE_ERROR_NO_MAPPING;
173  goto trace1;
174  }
175 
176  /* Entry should point to a mapping ...*/
177  map1 = pool_elt_at_index(nm->nsh_mappings, entry1[0]);
178  if (PREDICT_FALSE(map1 == 0))
179  {
180  error1 = NSH_NODE_ERROR_NO_MAPPING;
181  goto trace1;
182  }
183 
184  /* set up things for next node to transmit ie which node to handle it and where */
185  next1 = map1->next_node;
186  //vnet_buffer(b1)->sw_if_index[VLIB_TX] = map1->sw_if_index;
187 
188  if(PREDICT_FALSE(map1->nsh_action == NSH_ACTION_POP))
189  {
190  /* Manipulate MD2 */
191  if(PREDICT_FALSE(hdr1->md_type == 2))
192  {
193  if (PREDICT_FALSE(next1 == NSH_NODE_NEXT_DROP))
194  {
195  error1 = NSH_NODE_ERROR_INVALID_OPTIONS;
196  goto trace1;
197  }
198  //vnet_buffer(b1)->sw_if_index[VLIB_RX] = map1->sw_if_index;
199  }
200 
201  /* Pop NSH header */
202  vlib_buffer_advance(b1, (word)header_len1);
203  goto trace1;
204  }
205 
206  entry1 = hash_get_mem(nm->nsh_entry_by_key, &map1->mapped_nsp_nsi);
207  if (PREDICT_FALSE(entry1 == 0))
208  {
209  error1 = NSH_NODE_ERROR_NO_ENTRY;
210  goto trace1;
211  }
212 
213 
214  trace1: b1->error = error1 ? node->errors[error1] : 0;
215 
216  if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
217  {
218  nsh_input_trace_t *tr = vlib_add_trace(vm, node, b1, sizeof(*tr));
219  clib_memcpy_fast ( &(tr->trace_data), hdr1, (hdr1->length*4) );
220  }
221 
222  vlib_validate_buffer_enqueue_x2(vm, node, next_index, to_next,
223  n_left_to_next, bi0, bi1, next0, next1);
224 
225  }
226 
227  while (n_left_from > 0 && n_left_to_next > 0)
228  {
229  u32 bi0 = 0;
230  vlib_buffer_t * b0 = NULL;
231  u32 next0 = NSH_NODE_NEXT_DROP;
232  uword * entry0;
233  nsh_base_header_t * hdr0 = 0;
234  u32 header_len0 = 0;
235  u32 nsp_nsi0;
236  u32 error0;
237  nsh_map_t * map0 = 0;
238 
239  bi0 = from[0];
240  to_next[0] = bi0;
241  from += 1;
242  to_next += 1;
243  n_left_from -= 1;
244  n_left_to_next -= 1;
245  error0 = 0;
246 
247  b0 = vlib_get_buffer(vm, bi0);
248  hdr0 = vlib_buffer_get_current(b0);
249 
250  nsp_nsi0 = hdr0->nsp_nsi;
251  header_len0 = hdr0->length * 4;
252 
253  entry0 = hash_get_mem(nm->nsh_mapping_by_key, &nsp_nsi0);
254 
255  if (PREDICT_FALSE(entry0 == 0))
256  {
257  error0 = NSH_NODE_ERROR_NO_MAPPING;
258  goto trace00;
259  }
260 
261  /* Entry should point to a mapping ...*/
262  map0 = pool_elt_at_index(nm->nsh_mappings, entry0[0]);
263 
264  if (PREDICT_FALSE(map0 == 0))
265  {
266  error0 = NSH_NODE_ERROR_NO_MAPPING;
267  goto trace00;
268  }
269 
270  /* set up things for next node to transmit ie which node to handle it and where */
271  next0 = map0->next_node;
272  //vnet_buffer(b0)->sw_if_index[VLIB_TX] = map0->sw_if_index;
273 
275  {
276  /* Manipulate MD2 */
277  if(PREDICT_FALSE(hdr0->md_type == 2))
278  {
279  if (PREDICT_FALSE(next0 == NSH_NODE_NEXT_DROP))
280  {
281  error0 = NSH_NODE_ERROR_INVALID_OPTIONS;
282  goto trace00;
283  }
284  //vnet_buffer(b0)->sw_if_index[VLIB_RX] = map0->sw_if_index;
285  }
286 
287  /* Pop NSH header */
288  vlib_buffer_advance(b0, (word)header_len0);
289  goto trace00;
290  }
291 
292  entry0 = hash_get_mem(nm->nsh_entry_by_key, &map0->mapped_nsp_nsi);
293  if (PREDICT_FALSE(entry0 == 0))
294  {
295  error0 = NSH_NODE_ERROR_NO_ENTRY;
296  goto trace00;
297  }
298 
299  trace00: b0->error = error0 ? node->errors[error0] : 0;
300 
301  if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
302  {
303  nsh_input_trace_t *tr = vlib_add_trace(vm, node, b0, sizeof(*tr));
304  clib_memcpy_fast ( &(tr->trace_data[0]), hdr0, (hdr0->length*4) );
305  }
306 
307  vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next,
308  n_left_to_next, bi0, next0);
309  }
310 
311  vlib_put_next_frame(vm, node, next_index, n_left_to_next);
312 
313  }
314 
315  return from_frame->n_vectors;
316 }
317 
318 /**
319  * @brief Graph processing dispatch function for NSH Input
320  *
321  * @node nsh_input
322  * @param *vm
323  * @param *node
324  * @param *from_frame
325  *
326  * @return from_frame->n_vectors
327  *
328  */
329 static uword
331  vlib_frame_t * from_frame)
332 {
333  return nsh_pop_inline (vm, node, from_frame);
334 }
335 
336 static char * nsh_pop_node_error_strings[] = {
337 #define _(sym,string) string,
339 #undef _
340 };
341 
342 /* register nsh-input node */
344  .function = nsh_pop,
345  .name = "nsh-pop",
346  .vector_size = sizeof (u32),
347  .format_trace = format_nsh_pop_node_map_trace,
348  .format_buffer = format_nsh_pop_header,
349  .type = VLIB_NODE_TYPE_INTERNAL,
350 
352  .error_strings = nsh_pop_node_error_strings,
353 
354  .n_next_nodes = NSH_NODE_N_NEXT,
355 
356  .next_nodes = {
357 #define _(s,n) [NSH_NODE_NEXT_##s] = n,
359 #undef _
360  },
361 };
362 
364 
365 
u32 nsh_action
Definition: nsh.h:74
#define clib_memcpy_fast(a, b, c)
Definition: string.h:81
#define NULL
Definition: clib.h:58
u32 next_node
Definition: nsh.h:84
#define foreach_nsh_node_next
Definition: nsh.h:205
VXLAN GPE definitions.
static uword nsh_pop(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
Graph processing dispatch function for NSH Input.
Definition: nsh_pop.c:330
static char * nsh_pop_node_error_strings[]
Definition: nsh_pop.c:336
u8 * format_nsh_pop_node_map_trace(u8 *s, va_list *args)
Definition: nsh_pop.c:42
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:494
unsigned char u8
Definition: types.h:56
i64 word
Definition: types.h:111
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:188
unsigned int u32
Definition: types.h:88
vlib_node_registration_t nsh_pop_node
(constructor) VLIB_REGISTER_NODE (nsh_pop_node)
Definition: nsh_pop.c:343
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:511
Definition: nsh.h:59
nsh_map_t * nsh_mappings
Definition: nsh.h:116
uword * nsh_entry_by_key
Definition: nsh.h:113
unsigned short u16
Definition: types.h:57
VLIB_NODE_FUNCTION_MULTIARCH(nsh_pop_node, nsh_pop)
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:214
#define PREDICT_FALSE(x)
Definition: clib.h:111
#define vlib_validate_buffer_enqueue_x2(vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1)
Finish enqueueing two buffers forward in the graph.
Definition: buffer_node.h:70
#define vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next, n_left_to_next, bi0, next0)
Finish enqueueing one buffer forward in the graph.
Definition: buffer_node.h:218
#define vlib_get_next_frame(vm, node, next_index, vectors, n_vectors_left)
Get pointer to next frame vector data by (vlib_node_runtime_t, next_index).
Definition: node_funcs.h:368
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:139
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:169
u16 n_vectors
Definition: node.h:420
#define CLIB_PREFETCH(addr, size, type)
Definition: cache.h:79
vlib_main_t * vm
Definition: buffer.c:301
u8 * format_nsh_header(u8 *s, va_list *args)
Definition: nsh.c:245
u8 * format_nsh_pop_header(u8 *s, va_list *args)
Definition: nsh_pop.c:35
#define ARRAY_LEN(x)
Definition: clib.h:62
void vlib_put_next_frame(vlib_main_t *vm, vlib_node_runtime_t *r, u32 next_index, u32 n_vectors_left)
Release pointer to next frame vector data.
Definition: main.c:459
#define foreach_nsh_node_error
Definition: nsh.h:188
u32 mapped_nsp_nsi
Key for nsh_header_t entry to map to.
Definition: nsh.h:72
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:538
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:233
static void * vlib_add_trace(vlib_main_t *vm, vlib_node_runtime_t *r, vlib_buffer_t *b, u32 n_data_bytes)
Definition: trace_funcs.h:57
u8 * format_nsh_node_map_trace(u8 *s, va_list *args)
Definition: nsh.c:412
u64 uword
Definition: types.h:112
u8 trace_data[256]
Definition: nsh.h:173
static uword nsh_pop_inline(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
Definition: nsh_pop.c:49
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:274
nsh_option_map_t * nsh_md2_lookup_option(u16 class, u8 type)
Definition: nsh.c:181
#define hash_get_mem(h, key)
Definition: hash.h:269
u8 data[0]
Packet data.
Definition: buffer.h:176
nsh_main_t nsh_main
Definition: nsh.h:167
#define CLIB_CACHE_LINE_BYTES
Definition: cache.h:59
u32 flags
buffer flags: VLIB_BUFFER_FREE_LIST_INDEX_MASK: bits used to store free list index, VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:117
uword * nsh_mapping_by_key
Definition: nsh.h:119
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:62